Curtesy of petrochenkov

Hard-float (unlike mips32 musl targets but consistent with any other
musl target), MIPS64r2, n64 ABI.

Fix rust-lang#62677

…ments

…ichton

Add builtin targets for mips64(el)-unknown-linux-musl

This is prerequisite for rust-lang/libc#1449.

Tested locally to produce working static and dynamic binaries, ~~but CI config is untested for now~~ CI is to be added in a follow-up PR.

*edit: dynamic binaries also confirmed working!*

Tweak mismatched types error

- Change expected/found for type mismatches in `break`
- Be more accurate when talking about diverging match arms
- Tweak wording of function without a return value
- Suggest calling bare functions when their return value can be coerced to the expected type
- Give more parsing errors when encountering `foo(_, _, _)`

Fix rust-lang#51767, fix rust-lang#62677, fix rust-lang#63136, cc rust-lang#37384, cc rust-lang#35241.

Lint on some incorrect uses of mem::zeroed / mem::uninitialized

Cc rust-lang#62825 and https://internals.rust-lang.org/t/make-mem-uninitialized-and-mem-zeroed-panic-for-some-types-where-0-is-a-niche/10605

This does not yet handle `NonNull`/`NonZero*`, but it is a start.

I also improved some doc issues I hit on the way, and added a useful helper to `TyS`.

…s, r=Centril

Use associated_type_bounds where applicable - closes rust-lang#61738

…vink

Add test for issue 36804

I slightly reduced the repro that ICEs on nightly-2017-01-20.

Closes rust-lang#36804